JPH03158258A - Dot impact printer - Google Patents

Abstract

PURPOSE:To print out letters having the same quality as letters printed by 2n pins printing by selecting n pins printing in a 2n pins printing head and performing the n pins printing twice. CONSTITUTION:When a first printing is performed, namely, a 12 pins selecting switch 5 and a 12 pins position selecting switch 6 are turned on, an upper part of an original pattern corresponding to 1st to 12th dots is printed by upper 12 pins 9 partly constituting a printing head 8. When a second printing is performed, the lower part of the original pattern corresponding to 13th to 24th dots is printed by the upper 12 pins 9 of the printing head 8. Even if breakage of the pin of the printing head 8, trouble of a pin driving circuit, etc., make it impossible to use one of the pins of the printing head, n pins printing is selected so that pins, namely upper n pins or lower n pins, which are possible to be used are selected, thereby making it possible to guarantee the quality of the printing until a substitute comes to hand.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a dot-type printing device, and particularly to a dot-type printing device using a 24-pin printhead.

[Conventional technology]

In conventional dot-type printing devices, when printing characters in a matrix size of 24 vertical dots, all pins of the 24-pin print head are used for printing.

[Problem to be solved by the invention]

In the conventional dot-type printing device described above, if even the pins become unusable due to a broken pin in the print head, a failure in the pin drive circuit, etc., dots may be missing due to the unusable pins in dot printing, causing the printed characters to become unusable. The disadvantage was that it could not be identified.

[Means to solve the problem]

The dot type printing device of the present invention includes a 2nn pin head,
A switch to select n-pin printing or 2nn-pin printing,
It has a switch that selects the upper n-pin or the lower n-pin, and is characterized in that when n-pin printing is selected, the print data is printed twice.

〔Example〕

Next, an embodiment of the present invention will be described with reference to the drawings.

Referring to FIG. 1 showing an embodiment of the present invention, when the printer control unit 1 recognizes that the 12-pin print selection switch 5 is “ON”, the 12-pin print control unit 3 selects only the 12-pin of the print head 8. Use this to print the printing pattern in two parts.

When the original pattern shown in FIG. 2 is printed according to the present invention, the result will be as follows. When printing only with the upper 12 pins 9 of the print head 8 (12 pin print selection switch 5 "ON"
12-pin position selection switch 6 “ON”), Fig. 3 (
As shown in a), the upper part of the original pattern (
1 to 12 do, g) are printed using the upper 12 pins 9 of the print head 8. Next, line break for 12 dots, and the third
As shown in Figure (b), the lower side (13 to 24 dots) of the original pattern is printed using the upper 12 pins 9 of the print head 8. As a result, the original pattern can be printed as shown in FIG.

Next, when printing only with the lower 12 pins 10 of the print head 8 (12-pin print selection switch 5 "ON" and 12-pin position selection switch 6 "OFF"), as shown in FIG. The upper side (1 to 12 dots) of the original pattern is printed using the lower 12 pins 10 of the print head 8. Next, a line break is made by 12 dots and t, and in the second printing, the lower side (13 to 24 dots) of the original pattern is printed using the lower 12 pins 10 of the print head 8, as shown in FIG. 4(b). As a result, the fifth
The original pattern can be printed as shown in the figure.

In FIG. 5, the dots in black circles are the dots printed in the first printing, and the dots in diagonal circles are the dots printed in the second printing. In this way, printing can be performed by dividing the usable pins of the print head into two, so printing can be performed while avoiding the unusable pins to one side.

〔Effect of the invention〕

As explained above, the present invention has a 2nn pin head and an n
By selecting pin printing and printing twice, 2n
Characters with the same printing quality as n-pin characters can be printed, so even if a particular pin becomes unusable due to a broken pin in the print head, a failure in the drive circuit, etc., the print head can be switched to n-pin printing and the unusable pin can be printed. By selecting a position that does not include (upper n-pin or lower n-pin), printing quality can be guaranteed even until replacement parts are available.

[Brief explanation of the drawing]

FIG. 1 is a book diagram showing an embodiment of the present invention, and FIG. 2 is a diagram showing an original pattern to be printed. FIG. 3 is a diagram showing the printing results when the upper 12 pins are used. FIG. 3(a) shows the first printing pattern, and FIG. 3(b) shows the second printing pattern. FIG. 4 is a diagram showing the printing results when the lower 12 pins are used. FIG. 4(a) shows the first printing pattern, and FIG. 4(b) shows the second printing pattern. FIG. 5 is a diagram showing the final printing result. 1...Printer control unit, 2...24-pin print control unit, 3...12-pin print control unit, 4
......Horizontal feed, paper feed mechanism section, 5...1
2-pin print selection switch, 6...12-pin position selection switch, 7...Print head drive unit, 8...
...Print head, 9...Top 12 pin position, 10...Bottom 12 pin position. Figure 7

Claims (1)

[Claims] a 2n-pin print head, means for selecting 2n-pin printing or n-pin printing, means for selecting the upper n-pin or lower n-pin of the print head when the n-pin printing is selected, and the printing pattern at the time of selection twice. 1. A dot-type printing device characterized by having means for printing separately.